a sexual act where there are 4 locations, 6 positions, 8 continuous hours and at least 10 times of sex.

mfn-"i can't believe we just did the 4-6-8-10."
tb-"it's crazy, i mean, we did it in the kitchen, the bath tub, on the wall and on the stairs."
mfn-"not just that but we did in 6 different positions!"
tb-" but fuck, 8 hours is a long time..."
mfn-"it had to have been at least 10 times."